Combined system of coal pyrolysis reactor and pulverized coal boiler and its method for treating coal

Abstract

The invention provides a coal pyrolysis reactor-pulverized coal fired boiler combined system and a method for treating coal by utilizing the same.The combined system comprises a coal pyrolysis reactor and a pulverized coal fired boiler.The combined system enables the coal pyrolysis reactor and the existing pulverized coal fired boiler to be directly combined for usage without transformation of the existing pulverized coal fired boiler, the coal pyrolysis reactor and the pulverized coal fired boiler can relatively and independently operate, and mutual interference is relatively smaller.The combined system can be effectively used for producing combustible gas and pyrolysis oil and co-produces electric power, utilizes a conveying system of the existing pulverized coal fired boiler to achieve semi-coke hot conveying and ensure semi-coke combustion and reduces the cost of a coal topping process.In addition, a cyclone separator is built in the coal pyrolysis reactor so that the dust content of an oil-gas mixture of the coal pyrolysis reactor can be greatly reduced, further the pipeline blacking possibility in a follow-up process is effectively reduced, and heat preservation facilities are decreased.

Description

technical field [0001] The invention relates to the technical field of step-by-step utilization of coal, in particular to a coal pyrolysis reactor-coal pulverized boiler combined system and a method for processing coal using the same. Background technique [0002] The semi-coke produced after coal pyrolysis can be used as fuel to generate electricity. However, the existing coal pyrolysis topping process is mainly aimed at circulating fluidized bed power generation units. As a heat carrier, it realizes the pyrolysis of coal and recovers oil and gas by using the down-bed process. Because the existing system adopts a relatively complicated coal pyrolysis head-up process of solid or gas heat carrier, and the coal pyrolysis process produces oil and gas resources, for the power generation system, it is necessary to be equipped with a corresponding oil and gas treatment system, so the existing system configuration is various , the cost is high. [0003] figure 1 It is a structur...

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Problems solved by technology

However, the process is complicated, mainly because the process uses semi-coke as the heat carrier, so the process includes semi-coke heating, lifting, separation, mixing and other processes, which leads to an increase in the system process and greatly increases the system failure rate; at the same time, The semi-coke produced by this process can only be used for fluidized bed boilers and cannot be used for pulverized coal boilers

[0004] However, the proportion of pulverized coal boilers in my country's power generation system is very high. Due to the high requirements for coal volatiles and particle size in the combustion of pulverized coal boilers, there are currently few coal extraction processes for pulverized coal boilers.

[0005] Therefore, the current coal pyrolysis topping process still needs to be improved

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